Al the name adressed on the internet have a numeric ip.
To find the numeric ip use comand /dns name adress
Dns resolved www.yahoo.com
The reverse DNS is
Dns resolved 184.108.40.206 to p2.www.dcn.yahoo.com
so .. if u connect to IRC from the computer that has the 220.127.116.11 ip , when someone whois u , he will se something like this
YourNick is Ident@p2.www.dcn.yahoo.com
YourNick is Ident@www.yahoo.com
That is because the reverse DNS is not resolved to www.yahoo.com
even if www.yahoo.com
is rezolved to the same IP.
So , the easy way to have a Vhost is to buy a shell !
The hard one is to buy a domain , and u need to speak with your ISP or the NS (name sever) administrator (witch is in the most of the cases the ISP) to resolve your ip to your domain !